<template>
    <div class="goods-sku">
        <dl v-for="item in goods.specs" :key="item.id">
            <dt>{{ item.name }}</dt>
            <dd>
                <template v-for="val in item.values" :key="val.name">
                    <img :class="{ selected: val.selected, disabled: val.disabled }" @click="clickSpecs(item, val)"
                        v-if="val.picture" :src="val.picture" />
                    <span :class="{ selected: val.selected, disabled: val.disabled }" @click="clickSpecs(item, val)"
                        v-else>{{
                            val.name
                        }}</span>
                </template>
            </dd>
        </dl>
    </div>
</template>
<script lang="ts">
// @ts-nocheck
import { watchEffect } from 'vue'
import getPowerSet from './power-set'
const spliter = '★'
// 根据skus数据得到路径字典对象
const getPathMap = (skus: any[]) => {
    const pathMap: {
        [name: string]: any
    } = {}
    if (skus && skus.length > 0) {
        skus.forEach((sku: { inventory: any; specs: any[]; id: any }) => {
            // 1. 过滤出有库存有效的sku
            if (sku.inventory) {
                // 2. 得到sku属性值数组
                const specs = sku.specs.map((spec: { valueName: any }) => spec.valueName)
                // 3. 得到sku属性值数组的子集
                const powerSet = getPowerSet(specs)
                // 4. 设置给路径字典对象
                powerSet.forEach(set => {
                    const key = set.join(spliter)
                    // 如果没有就先初始化一个空数组
                    if (!pathMap[key]) {
                        pathMap[key] = []
                    }
                    pathMap[key].push(sku.id)
                })
            }
        })
    }
    return pathMap
}

// 初始化禁用状态
function initDisabledStatus(specs: any[], pathMap: { [x: string]: any }) {
    if (specs && specs.length > 0) {
        specs.forEach((spec: { values: any[] }) => {
            spec.values.forEach((val: { disabled: boolean; name: string | number }) => {
                // 设置禁用状态
                val.disabled = !pathMap[val.name]
            })
        })
    }
}

// 得到当前选中规格集合
const getSelectedArr = (specs: any[]) => {
    const selectedArr: never[] = []
    specs.forEach((spec: { values: any[] }, index: string | number) => {
        const selectedVal = spec.values.find((val: { selected: any }) => val.selected)
        if (selectedVal) {
            //ts-igonre
            selectedArr[index] = selectedVal.name
        } else {
            selectedArr[index] = undefined
        }
    })
    return selectedArr
}

// 更新按钮的禁用状态
const updateDisabledStatus = (specs: any[], pathMap: { [x: string]: any }) => {
    // 遍历每一种规格
    specs.forEach((item: { values: any[] }, i: string | number) => {
        // 拿到当前选择的项目
        const selectedArr = getSelectedArr(specs)
        // 遍历每一个按钮
        item.values.forEach((val: { selected: any; name: any; disabled: boolean }) => {
            if (!val.selected) {
                selectedArr[i] = val.name
                // 去掉undefined之后组合成key
                const key = selectedArr.filter(value => value).join(spliter)
                val.disabled = !pathMap[key]
            }
        })
    })
}


export default {
    name: 'XtxGoodSku',
    props: {
        // specs:所有的规格信息  skus:所有的sku组合
        goods: {
            type: Object,
            default: () => ({ specs: [], skus: [] })
        }
    },
    emits: ['change'],
    setup(props, { emit }) {
        let pathMap = {}
        watchEffect(() => {
            // 得到所有字典集合
            pathMap = getPathMap(props.goods.skus)
            // 组件初始化的时候更新禁用状态
            initDisabledStatus(props.goods.specs, pathMap)
        })

        const clickSpecs = (item: { values: any[] }, val: { disabled: any; selected: boolean }) => {
            if (val.disabled) return false
            // 选中与取消选中逻辑
            if (val.selected) {
                val.selected = false
            } else {
                item.values.forEach((bv: { selected: boolean }) => { bv.selected = false })
                val.selected = true
            }
            // 点击之后再次更新选中状态
            updateDisabledStatus(props.goods.specs, pathMap)
            // 把选择的sku信息传出去给父组件
            // 触发change事件将sku数据传递出去
            const selectedArr = getSelectedArr(props.goods.specs).filter(value => value)
            // 如果选中得规格数量和传入得规格总数相等则传出完整信息(都选择了)
            // 否则传出空对象
            if (selectedArr.length === props.goods.specs.length) {
                // 从路径字典中得到skuId
                const skuId = pathMap[selectedArr.join(spliter)][0]
                const sku = props.goods.skus.find((sku: { id: any }) => sku.id === skuId)
                // 传递数据给父组件
                emit('change', {
                    skuId: sku.id,
                    price: sku.price,
                    oldPrice: sku.oldPrice,
                    inventory: sku.inventory,
                    specsText: sku.specs.reduce((p: any, n: { name: any; valueName: any }) => `${p} ${n.name}：${n.valueName}`, '').trim()
                })
            } else {
                emit('change', {})
            }
        }
        return { clickSpecs }
    }
}
</script>

<style scoped lang="scss">
@mixin sku-state-mixin {
    border: 1px solid #e4e4e4;
    margin-right: 10px;
    cursor: pointer;

    &.selected {
        border-color: $xtxColor;
    }

    &.disabled {
        opacity: 0.6;
        border-style: dashed;
        cursor: not-allowed;
    }
}

.goods-sku {
    padding-left: 10px;
    padding-top: 20px;

    dl {
        display: flex;
        padding-bottom: 20px;
        align-items: center;

        dt {
            width: 50px;
            color: #999;
        }

        dd {
            flex: 1;
            color: #666;

            >img {
                width: 50px;
                height: 50px;
                margin-bottom: 4px;
                @include sku-state-mixin;
            }

            >span {
                display: inline-block;
                height: 30px;
                line-height: 28px;
                padding: 0 20px;
                margin-bottom: 4px;
                @include sku-state-mixin;
            }
        }
    }
}
</style>